[Antiga]

I had 7 rats, 6 from the miners, 1 bought in the underground sea fish. Did not use them early on, however their very valuable later on, where you still get +5 rage/+7 mana per level, and keep getting more leadership per level.

Trade in 350 leadership for 14 mana and 14 rage. Very good deal, even on level 5 the mana and rage are worth more in comparison from what you could gain from a level up.

I'm a Mage, used all of them. With my level 22 knight I also used all of them. Either way, these are nearly always useful on higher levels, where a few hundred leadership makes a small difference, whereas 20% extra rage and 10% extra mana(Probably even higher percentages for most people) is quite a large amount.

Edit: Bugmenot, A higher max rage, will mean a higher rage accumulation. Either way, the percentage of rage you'd have(Wether you had 30 rage or 120 rage) will be +/- the same. So in your theory, which I think is correct, the max amount of rage makes little difference for crits, just the accumulated amount in percentages. A warrior with 120 rage, will gain 120 rage from a single fight if he has max rage inflow and doesn't use his rage to kill the enemy, I have noticed this differs in earlier stages, seems to be lower(Even with max rage inflow). A warrior with 30 rage will gain 30 rage from the same fight.

Another edit: If you had an item for -300 leadership, +12 rage, +12 mana. Let's say an artifact.. I'd use it for sure.